/Engine/Source/Runtime/Core/Public/Misc/Compression.h
Thread-safe abstract compression routine to query maximum compressed size that could be made. CompressMemoryBound is strictly greater equal GetMaximumCompressedSize.
The maximum possible size of valid compressed data made by this format
static int32 GetMaximumCompressedSize ( [FName](API\Runtime\Core\UObject\FName) FormatName, int32 UncompressedSize, ECompressionFlags Flags, int32 CompressionData )